19121221

素因数分解:

$7^3\times {\mathrm{107}}^1\times {\mathrm{521}}^1$

素因数の和:649

約数の個数: 16

約数和(自身を含む): 22550400

約数和(自身を除く): 3429179

約数列:

[1, 7, 49, 107, 343, 521, 749, 3647, 5243, 25529, 36701, 55747, 178703, 390229, 2731603, 19121221]

約数ペア:

[(1, 19121221), (7, 2731603), (49, 390229), (107, 178703), (343, 55747), (521, 36701), (749, 25529), (3647, 5243)]